Lathe.



V G. F. DAVIS 82 W. N. PARSONS.

LATHE.

APPLIGATION FILED FEB. 7, 1908.

921,807, Patented May 18, 1909.

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0. P. DAVIS & W. N. PARSONS.

LATHE.

APPLIOATIONIILED 3315.7, 1908.

Patented May 18, 1909.

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' LATHE.

' APPLIOATION FILED FEB. 7, 1908.

Patented'May 18, 1909.

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G. F. DAVIS & W. N. PARSONS. LATHE.

APPLICATION FILED FEB. 7, 1908. 921,807, Patented May 18, 1909.

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0. F. DAVIS &w. N. PARSONS. LATHE APPLICATION FILED FEB. 7, 1908.

Patented May 18, 1909.

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UNITED STATIZRENT OFFEOE.

CHARLES F. DAVIS AND WILLIAM N. PARSONS, OF ROCHESTER, NEW YORK,ASSIGNORS TO THE W. P. DAVIS MACHINE (0., OF ROCHESTER, NEW YORK, ACORPORATION OF NEW YORK.

LATHE Specification of Letters Patent.

Patented May 18, 1909.

Application filed February 7, 1908. Serial No. 414,684.

T all whom it may concern:

Be it known that we, CHARLES F. DAVIS and I'VILLIAM N. PARSONS, both ofRochester, in the county of Monroe and State of New York, have inventedcertain new and useful Improvements in Lathes; and we do hereby declarethe following to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thespecification, and to the reference-numerals marked thereon.

The present invention relates to power lathes and more particularly tothose which are provided with devices for automatically effecting therelease of the tool-carrying slide from its driving mechanism when thetool has completed a predetermined movement; one object of the inventionbeing to provide two feeding mechanisms for the tool-- carrying slide,one for producing screw threads and the other for ordinary work, andanother object being to provide an improved means whereby the shiftingof a turret on the tool-carrying slide will determine a feeding movementof the toolcarrying slide corresponding with the tool employed.

To these and other ends the invention consists in certain improvementsand combinations of parts all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings: Figure 1 is a side view of a lathe, partly in section,embodying this invention; Fig. represents an end elevation; Fig. 3 is asection on line 00-51: of Fig. 2, showing a view of the inner face ofthe apron of the turret slide; Fig. 1 is a vertical section through theturret and the turret slide; Fig. 5 is a detail sectional view of theturret slide 3 Figs. 6, 7 and 8 are sectional views on lines a-a bb andcc, respectively, of Fig. 3; Figs. 9 and 10 are sectional views on lines(Zd and e-e, respectively, of Fig. a; Figs. 11 and 12 represent,respectively, a top view of the turret and a section on line ff of Fig.11, and Fig. 13 is a detail sectional view showing a device for lockingthe turret against rotation.

Similar reference numerals in the several figures indicate similarparts.

The invention is herein shown as embodied in a turret lathe comprising aframe 1 supporting a drive shaft 2 on which is mounted a suitable chuck3, the drive shaft being connected by a compound gearing 4 to a countershaft 5 which in turn is connected by variable gearing 6 to shaft 7extending longitudinally of the frame 1. The shaft 7 is divided near oneend and has a reversing clutch 8 connected to the members thereof,operable by foot pieces 9; while at its extreme end the shaft is gearedat 10 to a feed screw 11 arranged on one side of the machine and servingas the driving mechanism for the usual cross feed slide 12 and theturret or tool-carrying slide 13, both of which are movable onlongitudinally extending ways or guides 14 on the top of the bed orframe 1.

The feeding of the turret slide which forms one of the features of thisinvention is accomplished by two mechanisms, one of which is adapted forordinary work and the other of which is employed when forming screwthreads.

The first of the mechanisms embodies preferably a divided nut forengagement with the screw 11, the members 15 and 16 of the nut beingguided at their ends on parallel ways 17 and normally held apart by anysuitable means, a spring 18 in the present instance effecting theirseparation. Devices for moving the members into engagement with the feedscrew preferably embody a pair of links 19 each pivoted at one end tothe nut members and at their other ends eccentrically connected to adisk 20 which is secured to the inner end of a stub shaft 20" journaledon the apron 21 that depends from the turret slide, the outer end of thestub shaft being provided with a crank arm 22.

A locking device for the operating device of the nut may consist of anotched disk 23 engaged by a dog 24 or latch that is pivoted at 25 tothe outer face of the apron and operated in a manner to be described.

The mechanism for feeding the turret slide to cut screws preferablycomprises a sleeve 26 journaled on an arm 27 which projects from theinner face of the apron. 'i his sleeve -carries on its inner face afeather 28 working in a longitudinally extending slot 23 in the screw11, in order that the sleeve may turn with the screw but movelongitudinally thereof. Between the sleeve and a rack 29 on the frame orbed is provided a speed reducing gearing preferably embodying a worm 30on the sleeve 26 meshing with a worm wheel 31 secured to a hollow shaft32 that is journaled on a stub bearing 33 which projects inwardly fromthe apron. Also mounted on the hollow shaft 32 is a pinion 34 gearingwith a pinion 35 which in turn meshes with a pinion 36 that turns alarge gear 37, the latter being also j ournaled on the apron. A pinion38 coaxial with the gear 37 gears with the rack 29, and in this mannerthe rotation of the sleeve effects the advancement of the turret slideon the frame or bed 1.

In order to release the slide from the driv ing mechanism, the pinions35 and 36 may be carried on a swinging plate 39 which is journaled onthe bearing 33, a latch 40 serving as a means to hold the plateelevated, so that the pinion 36 meshes with the gear 37, and said latchbeing pivoted on the outside of the apron at 42 and having one endengaging the pin 43 that projects through a slot 44 in the apron. An arm45 projecting from the plate 39 through a slot 46 in the apron serves asa means by which the plate may be moved manually to effect the meshingof pinion 36 and gear 37, while a hand wheel 47 journaled on the apronand having a pinion 48 on its inner end meshing with the gear 37 servesas a manually operable means for moving the turret slide on the frame orbed when the slide is disconnected from sleeve 26.

Another feature of this invention is the provision of a single devicefor breaking connection between the turret slide and the feeding shaft.For this purpose the latches 24 and 40 may have their operating portionslocated in proximity to each other so that a single tripping device mayoperate them. This tripping device is preferably in the form of aswinging lever 49 having two extensions 50 and 51 for engaging the twolatches and an arm 52 by which it may be manually operated. The trip isalso adapted to be operated automatically when the turret slide reachesa predetermined position and for this purpose may be secured to a shaft53 journaled on the turret slide and having at its inner end a crankportion 54. The tripping means, formed in this instance by lever 49,shaft 53 and crank arm 54, is operated at different periods by anoperating device and the relative position of the operating device and aplurality of stops 59 may be controlled by the turret in a manner to bedescribed. This operating device preferably comprises a horizontallyswinging arm 55 pivoted at 56 to the turret slide and nor mally held inone position by a coil spring 57, a dog 58 being pivoted on the arm. andbeing movable upwardly to engage the prank to move the trip lever 49.

The movement of the dog 58 may be effected by one of the series of stops59 preferably arranged on the bed or frame beneath the turret slide,adjustable in ways or inverted T grooves 60 and held in their-adjustedpositions by T bolts 61 fitting in the grooves, the under surface of thestops being formed with fins 62 fitting in the contracted portions ofthe grooves to prevent lateral movement of the stops. The forward endsof the stops are beveled at 59, while shoulders 59 are formed at theends of the beveled portions," and in order that a plurality of stopsmay work on a single way some of them are provided with lateral offsetportions 63 to which the bolts 61 are secured. In operation the arm 55is swung so that the dog 58 will engage the beveled portion of a certainone of the stops 59 when the turret slide nears the end of its movement,thus causing the crank 54 to be engaged by the dog and the shaft 53 tobe rotated so that the lever 49 will engage the latch 24 or the latch40. The engagement of the nose 58 of the dog with shoulder 59 effects apositive stop of the turret slide and if the slide comes to a stopbefore the shoulder is reached the hand wheel 47 may be employed tocarry the dog to the shoulder. 1

As before mentioned, the position of the operating device is controlledby the turret which for this purpose is journaled on the turret slideand carries a plurality of projections 64 extending different distancesfrom the axis of the turret, so that when the ends of the projectionsengage the arm 55 the latter will be moved about its pivot and carry thedog to a stop 59 corresponding to the projection. The projections areconnected. by inclined faces 65 so that they form a cam.

The turret slide may be centered in its adjusted position by a suitabledevice which preferably comprises a slide 66 mounted on the turret slideand movable in a direction radial to the axis of the turret by amanually operable lever 67 so that its beveled end 68 may engage a Vshaped notch in a ring 70 depending from the upper enlarged'portion 71of the turret. A spring 72 serves to move the slide 66 normally intoengagement with the turret. In order to positively clamp the turretagainst rotation, we provide the slide with an opening formed by aninternal flange 77, the upper face of the flange serving as a frictionface at the upper end of the opening, while surrounding the other orlower end of the opening is an externally threaded flange 75 whichpreferably is formed separately from flange 77 but is rigidly securedthereto, being in this instance carried by a sleeve which is forced intothe opening formed by said flange 77. Arranged to turn in the opening inthe slide is the reduced or bearing portion 76 of the turret whichcarries a shoulder 76 preferably formed on a remov able portion 76 thatin this instance carries cam projections 64 and. is secured to thebearing portion by a bolt 76, a pin 76 acting to prevent relativerotation between the parts. The shoulder 76 is adapted to be engaged bythe ring or nut 73 mounted on the flange 75 (shown disengaged in Fig.at) in order to draw the turret into engagement with the friction faceon the slide, the ring being operable by an arm 74 which projectsthrough a slot in the slid-e (see Fig. 9). The removal of bolt 76permits the portion 76 to be separated from the turret and the latter tobe withdrawn from the slide.

The turret may carry a number of tools 78, in the present instance sixbeing used. It is formed with a central bore 79 to provide a pocket fortools and radial bores 80 intersect the same. The radial bores are inturn intersected by vertical bores 81 in which are arranged clampingsleeves 82 having passed therethrough headed bolts 83 which engage screwthreaded sockets at the base of the bores. The tools 78 upon beinginserted in bores 80 may be engaged by sleeves 82 upon the tightening ofbolts 83, thus being effectively held against movement.

hile the operation will be fully understood from the foregoingdescription, a general statement thereof will now be given: hen themachine is einployed for the usual run of work the divided nut is throwninto engagement with screw 11 by means of crank arm 22 and the latch 24engages disk 28'. The turret is adjusted so that the operating dog willbe positioned to engage one of the stops 59 when the turret slide nearsthe end of its movement, and this engagement effects the operation ofthe trip lever 49 to stop the feed of the turret slide. Of course,during this feeding the screw feeding mechanism is not in connectionwith the feeding screw 11, butwhen the nut is separated from the latterthe screw feeding mechanism may be thrown in by lifting on the arm 45.The latch 40 drops beneath pin 43 by gravity and is engaged by the triplever 49 in the same manner that latch 24 is engaged.

A lathe constructed in accordance with this invention is adapted fornearly any type of work and as its operations are practically allautomatic, exclusive attention is not re quired by the operator.

We claim as our invention:

1. The combination with a bed and a slide movable thereon, of a pair offeeding mechanisms for the slide each having means normally moving it toinoperative position, a latch for holding each feeding mechanism inoperative position, and a single device for operating the latch to causethe feeding mechanism to be thrown out of operation.

2. The combination with a bed and a slide movable thereon, of a feedshaft mounted on the bed, a pair of feeding mechanisms for the slide,operated by the shaft and normally moving to destroy driving connectionbetween the shaft and the slide, latches for retaining said feedingmechanisms in feeding positions, and a single trip for operating bothlatches.

3. The combination with a bed and a slide movable thereon, of a feedscrew mounted on the bed, a divided nut carried by the slide, a latchfor holding the members of the nut in en 'ageitnent with the feed screw,a sleeve secured to the feed screw to turn therewith but to movelongitudinally thereof, driving connection between the sleeve and thebed embodying a pinion movable to break the dri\" ing connection, alatch for holding the pinion in driving position, and a single trip foroperating both latches.

4. he combination with a bed, a slide and a turret carried by the slide,of a pair of feeding mechanisms each adapted to shift the slide, adevice for controlling both feeding mechanisms, and a stop for operatingsaid device at a certain position of the slide.

The combination with a bed and a slide thereon, of a feeding mechanismfor the slide, means for holding the feeding mechanism in operativeposition, a tripping device for the holding means embodying a crankportion,

an operating device for the trip comprising a swinging arm carrying adog movable to co operate with the crank portion, a plurality of stopscooperating with the dog for moving it to engage the crank portion, anda turret having means for positioning the arm so that the dog willengage a stop corresponding to the position of the turret.

6. The combination with a bed and a slide thereon, of a feedingmechanism for the slide, a tripping device for the feeding mechanism, anoperating device for the tripping device embodying a dog movable tooperate a tripping device, and a stop having a beveled portion tocooperate with the dog to effect the movement of the tripping device anda shoulder to be engaged by the dog to limit the movement of the slide.

7. The combination with a bed and a slide thereon, of a feedingmechanism for the slide, a device for controlling the disconnection ofthe feeding mechanism with the slide, a dog on the slide movable in ahorizontal plane and also movable to cooperate with said device to moveit, a plurality of stops arranged in a horizontal plane on the top ofthe bed to engage and move the dog, and a turret on the slide havingmeans controlling the movement of the dog in a horizontal plane to causesaid dog to cooperate with one of said stops. I

8. The combination with a bed and a slide thereon, of a feedingmechanism for the slide, a device for controlling the disconnection ofthe feeding mechanism with the slide, a dog on the slide controllingsaid device, a plurality of stops adjustable in a single way on the bedhaving offset portions permitting them to be set side by side, and aturret on said device, a plurality of stops arranged on the top of thebed in a horizontal plane and engaging the dog to effect the movement ofthe latter, and a turret on the slide having a plurality of projectionsof different lengths to engage the arm in order to move the doghorizontally so that said dog may engage with one of the stops.

10. The combination with a bed and a slide thereon, of a feedingmechanism for the slide, a device controlling the feeding mechanism, anarm pivoted on the slide adjacent to said device to swing in ahorizontal plane and having a movable dog thereon to engage said device,a plurality of stops arranged on the top of the bed in a horizontalplane to cooperate with a dog to move it, a turret on the slide, andmeans operated by the turret for moving the dog horizontally so thatsaid dog will engage one of the stops.

11. The combination with a turret slide carrying a stationary bearingmember externally threaded near one end and a friction face located nearthe opposite end of the bearing member, of a turret having a bearingportion projecting into the bearing member and provided with asurrounding shoulder beyond thefree end of said bearing member, ofgreater diameter than the other so as to project beyond the same andcooperating with the free end, and a nut turning on the .externalthreads of the bearing and movable to cooperate with the shoulder on theturret to move the latter into engagement with the friction face of theslide.

12. The combination with a bed and a slide thereon, of a feedingmechanism for the slide, a device controlling the feeding mechanism, adevice movable on the slide in proximity to the controlling device andhaving a movement in a horizontal plane, a movable dog thereon adaptedto engage the controlling device, a plurality of stops arranged on thetop of the bed in a horizontal plane to cooperate with the dog to moveit, and a turret on the slide controlling the horizontal position of thedog carrying device relative to the stops.

13. The combination with a bed and a plurality of stops thereonarranged. in a single plane, of a slide movable on the bed, a feedingmechanism for the slide, a device controlling the feeding mechanism, adevice mounted on the slide in proximity to the controlling device andhaving a movement in a plane parallel with the plane of the stops, amovable dog arranged on the lastmentioned device, and adapted to engagethe controlling device, and a turret on the slide controlling theposition of the dog carrying device relative to the stops.

14. The combination with a bed and a slide movable thereon, of a feedingmechanism for the slide, a controlling device for the feeding mechanism,an operating device for said 0011- trolling device embodying a dogmovable to operate the controlling device, and a stop having a beveledportion on which the dog rides to cause the latter to actuate thecontrolling device.

OHARLES F. DAVIS. WILLIAM l. PARSONS. lVitnesses: I

RUssELL B. GRIFFITH, HAROLD H. SIMMs.

